app/views/tasks/gis/match_georeference/_georeferences_selections_form.html.erb
<div id="_select_gr_form" name="_select_gr_form"
data-feature-collection='<%= Gis::GeoJSON.feature_collection(georeferences).to_json %>'
data-map-center='POINT (0.0 0.0 0.0)'
data-map-canvas="show_gr_canvas"
>
<table>
<tr>
<td>
<div id="show_gr_canvas" style="width:512px; height: 256px;"></div>
</td>
</tr>
</table>
</div>